4x-13/x-5

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Solution for 4x-13/x-5 equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

4*x-(13/x)-5 = 0

4*x-13*x^-1-5 = 0

4*x^1-13*x^-1-5*x^0 = 0

(4*x^2-5*x^1-13*x^0)/(x^1) = 0 // * x^2

x^1*(4*x^2-5*x^1-13*x^0) = 0

x^1

4*x^2-5*x-13 = 0

4*x^2-5*x-13 = 0

DELTA = (-5)^2-(-13*4*4)

DELTA = 233

DELTA > 0

x = (233^(1/2)+5)/(2*4) or x = (5-233^(1/2))/(2*4)

x = (233^(1/2)+5)/8 or x = (5-233^(1/2))/8

x in { (5-233^(1/2))/8, (233^(1/2)+5)/8} 

x in { (5-233^(1/2))/8, (233^(1/2)+5)/8 }

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